How do you propose to keep the FETs powered on without a gate voltage? How is the FET going to work in dual polarity as it is only an N channel FET?
They need power to work! Where is your power source?
Googling IPI110N20N3 produces data on a 80Amp N channel FET.
http://www.infineon.com/dgdl/Infine...n.pdf?fileId=db3a3043243b5f170124968e7d1f18e7
Googling IPI110N20N3 produces data on a 80Amp N channel FET.
http://www.infineon.com/dgdl/Infine...n.pdf?fileId=db3a3043243b5f170124968e7d1f18e7
The TLP591 is a special optocoupled MOSFET driver, which provide the necessary power. Google for it!
Sajti
The TLP591B driver is an optoisolator that develops around 7V on it's own. I've been building these for a year now. They work great.
http://www.mouser.com/ds/2/408/TLP591B_datasheet_en_20140901-739125.pdf
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I've been building mine with a ASSR-V622-302E dual driver and IPB025N-10NG 180A mosfets. The combination works great, and is still expensive, but not quite as painful.
ASSR-V622-302E has faster switching time than TLP591, but these are SMD only, is that right?
They are through hole size gull wing package. Very easy to solder. I think there's a though hole version too.
drgnanam,
For the opto-voltaic, the vom1271 is a much better unit - cheaper, readily available, and contains a fast turn off circuit (not just a resistor).
See also my post at http://www.diyaudio.com/forums/soli...rid-amp-inspired-hugh-dean-3.html#post4767263
Regards,
Paul Bysouth
For the opto-voltaic, the vom1271 is a much better unit - cheaper, readily available, and contains a fast turn off circuit (not just a resistor).
See also my post at http://www.diyaudio.com/forums/soli...rid-amp-inspired-hugh-dean-3.html#post4767263
Regards,
Paul Bysouth
These devices are all expensive. The ASSR-V622-302E is pretty much the same thing in a dual package that's not a lot more money, so a bit cheaper to work with.
Digi are more expensive.
RS, Rapid, CPC don't stock vom1271,
Farnell do ten for £12.70+VAT & postage
RS, Rapid, CPC don't stock vom1271,
Farnell do ten for £12.70+VAT & postage
TLP591B has switch-off time 3ms
vom1271 has 24us (micro), so it's way faster, and costs $1 less than TLP,
so I guess I'll give it a try in my next board.
ASSR-V622-302E has 30us switch-off time, and it's dual, so it seems like
a best fit, if price is right.
The circuit with upc1237 doesn't need any changes to use vom1271.
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hi paulbysouth,
thanks for input, its cheaper than tlp and better too with fast switching time
hi minek 123 ,
thanks for the circuit, i am changing the cad to your circuit using amp rail instead of external power, since u said vom1271 is straight fit, iam changing that too
thanks for input, its cheaper than tlp and better too with fast switching time
hi minek 123 ,
thanks for the circuit, i am changing the cad to your circuit using amp rail instead of external power, since u said vom1271 is straight fit, iam changing that too
If you use amp rail (+) to power optocouplers - you need current 20mA,
around 4V-5V across 2 optocouplers. If your rails are low voltage, it's OK to lower this with a zener, or zener + transistor. For higher rails - in my case 75V - you need to drop 70V. That's a lot of volts, and a lot of heat.
I used XL7015 DC-DC buck converter for this task.
https://www.amazon.com/gp/product/B01HXRE62K/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
Alternatively, for high rails, you can also use separate, little switching power supply (say 12V) - you can by them cheaply, and put inside amp case.
Hi minek123,
OK then I will stick with your 12v circuit,so will again redraw and post cad please check for me ,will use buck like u have used,
Thanks
OK then I will stick with your 12v circuit,so will again redraw and post cad please check for me ,will use buck like u have used,
Thanks
This buck converter (XL7015) is the only one I know, that allows
up to 80V input voltage, and I bought last 3 of them from Amazon..
If you find more available online, let me know 🙂
If you have lower rails, say up to 50V, 3W-4W resistor may work ok, but
it will definitely run very hot. That's why I switched to buck converters
or separated switching supplies 12V. Usually you need them anyway in your amp to power preamps, lights, buffers, slow start, etc....
Hi minek123,
Decided to power with 12 DC, can I lose the 4148 diode
Added 100nf snubberand 12v owner to protect MOSFET,but I don't understand idea of catch diode which is connected to amps rails and to speaker output ,if you know can u explain me ,if I do it do I have to implement in both channels.
Some members ex(thimos/stillforgiven)in 100 watt ultimate amplifier thread used apex design reported slight hum and no reason or solution given by anybody,
Is any hum or distortion contributed by this to output ,what is your experience
I am avoiding relay in thinking that is faster,safer and better,can u advice
Decided to power with 12 DC, can I lose the 4148 diode
Added 100nf snubberand 12v owner to protect MOSFET,but I don't understand idea of catch diode which is connected to amps rails and to speaker output ,if you know can u explain me ,if I do it do I have to implement in both channels.
Some members ex(thimos/stillforgiven)in 100 watt ultimate amplifier thread used apex design reported slight hum and no reason or solution given by anybody,
Is any hum or distortion contributed by this to output ,what is your experience
I am avoiding relay in thinking that is faster,safer and better,can u advice
Hello I need some help. My Seer FA-5001 amp switches on then go into protect mode but the sound continues to play.